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" hat: "4cos12^(@)cos48^(@)cos72^(@)=cos...

" hat: "4cos12^(@)cos48^(@)cos72^(@)=cos36^(@)

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Prove that: 4cos12^(0)cos48^(0)cos72^(0)=cos36^(@)

cos48^(@)*cos12^(@)=

cos48^(@)*cos12^(@)=

Prove that: i) cos10^(@)cos30^(@)cos50^(@)cos70^(@)=3/16 ii) cos20^(@)cos40^(@)cos60^(@)cos80^(@)=1/16 iii) 4cos12^(@)cos48^(@)cos72^(@)=cos36^(@) iv) cos40^(@) cos80^(@)cos160^(@)=-1/8

Prove that: i) cos10^(@)cos30^(@)cos50^(@)cos70^(@)=3/16 ii) cos20^(@)cos40^(@)cos60^(@)cos80^(@)=1/16 iii) 4cos12^(@)cos48^(@)cos72^(@)=cos36^(@) iv) cos40^(@) cos80^(@)cos160^(@)=-1/8

cos36^(@)-cos72^(@)=

cos12^(@)cos24^(@)cos48^(@)cos84^(@)

cos6^(@)sin24^(@)cos72^(@)=

cos6^(@)*sin24^(@)*cos72^(@)=